Julie Morgenstern refers to "Structure and Discipline." The time map (structure) sets up time zones for @errands, @office, @calls, or @ anywhere.
The discipline is assigning NAs, based on estimated completion time, to the time map. And when a day's or week's @meeting, for example, is full--have the discipline to continue scheduling into the next week's time zone instead of overflowing, say, @meeting into your @office zone. Discipline. Ah...a valeity?sp